Top definition
Noun - Someone who occasionally watches you by going to your profile to see if you have any new photos. Someone can be called an instaspy if they like your somewhat recent photos after an extended time has passed in which your photo no longer appears in the feed, meaning that they saw it on your profile.

Verb - The act of repeatedly going on a person's profile to see if they have any new pictures. The liking of photos may occur but is not necessary.
"Whatshisname is such an instaspy. I put this photo up 2 weeks ago and he's just liking it."
by Espeonage December 13, 2013
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